JP2007228240A - Image processor and processing method - Google Patents

Image processor and processing method Download PDF

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JP2007228240A
JP2007228240A JP2006046792A JP2006046792A JP2007228240A JP 2007228240 A JP2007228240 A JP 2007228240A JP 2006046792 A JP2006046792 A JP 2006046792A JP 2006046792 A JP2006046792 A JP 2006046792A JP 2007228240 A JP2007228240 A JP 2007228240A
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saturation
color
hue
brightness
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JP4745081B2 (en
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Naoko Kondo
尚子 近藤
Shiyoubou Chiyou
小▲忙▼ 張
Satoshi Ueno
諭 上野
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Sharp Corp
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<P>PROBLEM TO BE SOLVED: To provide an image processor and an image processing method capable of simultaneously adjusting lightness/saturation/hue in a YUV/CrCb image. <P>SOLUTION: The image processor is provided with a display device for adjusting colors displayed by inputted signals, has a means for performing polar coordinate conversion of Cr and Cb among values of input signals, a lightness adjusting means for specifying a color by using an angle in a polar coordinate space and adjusting the lightness of the specified color, a saturation adjusting means for adjusting the saturation of the specified color and a hue adjusting means for adjusting the hue of the specified color, and respectively independently adjusts the lightness, the saturation and the hue. The image processor has a means for using a plurality of reference colors to divide a color region, and a means for regarding a specific color as the extension of reference colors of both sides of the specific color and representing a regarding degree by a weighting coefficient of the reference colors, and adjusts the lightness, saturation and hue of the specific color by using adjustment parameters of the both reference colors. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、画像処理装置及び画像処理方法に関し、特に色補正回路、及び該回路を備えたテレビ、カメラ、ＤＶＤなどの映像機器に関する。   The present invention relates to an image processing apparatus and an image processing method, and more particularly to a color correction circuit and video equipment such as a television, a camera, and a DVD including the circuit.

テレビなどの表示装置に入力される放送信号は、ＩＴＵ−Ｒ ＢＴ ６０１の規格が採用されており、明度Ｙ、式差Ｃｒ／Ｃｂ（またはＵＶ）とＲＧＢの関係は式１によって表される。

Figure 2007228240
Broadcast signals input to a display device such as a television adopt the ITU-R BT 601 standard, and the relationship between brightness Y, formula difference Cr / Cb (or UV), and RGB is expressed by formula 1.
Figure 2007228240

式１の条件では、式差Ｃｒ／Ｃｂの値の範囲が異なっているが、デジタル信号として扱う場合には不都合があるため正規化処理する。それを式２に示し、その逆変換を式３に示す。

Figure 2007228240

Figure 2007228240
 Under the condition of Expression 1, the range of the value of the expression difference Cr / Cb is different, but normalization is performed because it is inconvenient when handled as a digital signal. This is shown in Equation 2, and its inverse transformation is shown in Equation 3.
Figure 2007228240
Figure 2007228240

Ｙ、Ｃｂ、Ｃｒ、Ｒ、Ｇ、Ｂは、それぞれ以下の条件４を満たしている。

Figure 2007228240
Y, Cb, Cr, R, G, and B each satisfy the following condition 4.
Figure 2007228240

式３によってＹＵＶ信号からＲＧＢ信号に変換されたＲＧＢ信号がディスプレーなどのモニターに入力され表示される。モニターは、様々な画質調整機能を有している。この調整には、画質向上のためモニター側で設定される場合や、使用目的や環境もしくは個人の好みに応じて外部から設定される場合等がある。   The RGB signal converted from the YUV signal to the RGB signal by Equation 3 is input and displayed on a monitor such as a display. The monitor has various image quality adjustment functions. This adjustment may be set on the monitor side in order to improve the image quality, or may be set from the outside according to the purpose of use, environment or personal preference.

画質調整のうち、表示色を調整する方法の１つに色の三属性を調整する方法がある。色の三属性とは『彩度』『明度』『色相』のことであり、これらはお互いに独立した３要素である。代表的なものにマンセルの表色系があり、物体色の標準として広く用いられている。   Among image quality adjustments, one of the methods for adjusting the display color is a method for adjusting three color attributes. The three attributes of color are “saturation”, “lightness”, and “hue”, and these are three elements independent of each other. A typical example is the Munsell color system, which is widely used as a standard for object colors.

テレビにおいては、ＹＵＶ信号に対して特定の色ではなくすべての色域に対して三属性を調整する方法がある。例えば、式５のＣＯＬを１より大きくすることによって画像の彩度を上げることができ、画面は鮮やかになる。

Figure 2007228240
In television, there is a method of adjusting three attributes for all color gamuts instead of a specific color for YUV signals. For example, the saturation of the image can be increased by making COL in Expression 5 greater than 1, and the screen becomes vivid.
Figure 2007228240

また、特定の色に対する補正については、特許文献１に、ＲＧＢ色空間で色調整を行う方法が示されている。特許文献２には、ＹＭＣ色空間で色調整を行う方法が示されている。本発明者はＹＵＶ色空間で３属性を調整する方法を提案している（特許文献３、未公開）。
特許第３１２８４２９号公報 特開平７−１７０４０４号公報 特願２００５−１２６１４７号 As for correction of a specific color, Patent Document 1 discloses a method of performing color adjustment in the RGB color space. Patent Document 2 discloses a method for performing color adjustment in a YMC color space. The inventor has proposed a method of adjusting three attributes in the YUV color space (Patent Document 3, unpublished).
Japanese Patent No. 3128429 JP-A-7-170404 Japanese Patent Application No. 2005-126147

色の個別調整については、特許文献１はＲＧＢ信号で行う方法が示されている。また、特許文献２では、特定の色に対する調整は可能であるが、ＹＭＣ空間で処理を行うものである。テレビの入力信号はＹＵＶ信号であるので、ＹＵＶ信号で処理することが望ましい。   Regarding individual color adjustment, Patent Document 1 discloses a method of performing RGB signals. In Patent Document 2, although adjustment for a specific color is possible, processing is performed in the YMC space. Since the input signal of the television is a YUV signal, it is desirable to process with the YUV signal.

本発明者はＹＵＶ色空間で３属性を調整する方法を提案したが（未公開）、その中で彩度と色相を同時に調整することができない。色相の補正結果と彩度の補正結果は同じくＣｂｏｕｔとＣｒｏｕｔと記載しており、お互いに反映されないため、色相か彩度かどちらかの補正しかできない。 The present inventor has proposed a method for adjusting three attributes in the YUV color space (unpublished), but cannot adjust the saturation and hue at the same time. The hue correction result and the saturation correction result are similarly described as Cb out and Cr out, and are not reflected in each other, so only the correction of either hue or saturation can be performed.

本発明は、ＹＵＶ／ＣｒＣｂ画像において、明度・彩度・色相を同時に調整することができる画像処理装置及び画像処理方法を提供することを目的とする。   An object of the present invention is to provide an image processing apparatus and an image processing method capable of simultaneously adjusting brightness, saturation, and hue in a YUV / CrCb image.

本発明は、ＹＵＶ／ＣｒＣｂ画像においてＣｒＣｂ／ＵＶ空間を極座標空間に変換して、極座標空間の角度を用いて色を特定し、特定した色に対して色相調整用の角度を算出する。算出した色相の値に対して彩度の補正を反映させることである。   The present invention converts a CrCb / UV space into a polar coordinate space in a YUV / CrCb image, specifies a color using an angle of the polar coordinate space, and calculates an angle for hue adjustment with respect to the specified color. The saturation correction is reflected on the calculated hue value.

すなわち、本発明は、入力された信号により表示される色を調整する表示装置を備えるとともに、入力信号の値のうちのＣｒ、Ｃｂを極座標変換する手段と、極座標空間の角度を用いて色を特定し、特定した色に明度の調整を行う明度調整手段と、特定した色に彩度の調整を行う彩度調整手段と、特定した色に色相の調整を行う色相調整手段とを有し、明度、彩度及び色相の調整をそれぞれ独立して行う画像処理装置である。   That is, the present invention is provided with a display device that adjusts the color displayed by the input signal, and at the same time, the color is converted by using means for converting polar coordinates of Cr and Cb in the value of the input signal and the angle of the polar coordinate space. A brightness adjustment means for adjusting the brightness of the specified color, a saturation adjustment means for adjusting the saturation of the specified color, and a hue adjustment means for adjusting the hue of the specified color, This is an image processing apparatus that independently adjusts brightness, saturation, and hue.

また、本発明は、複数基準色を用いて色領域を分割する手段と、特定な色をその両側の基準色の延長と見做し、見做す程度は基準色の重み係数で表する手段と有し、両基準色の調整パラメータを用いて特定色の明度、彩度及び色相の調整を行う画像処理装置である。   Further, the present invention provides means for dividing a color region using a plurality of reference colors, means for regarding a specific color as an extension of the reference colors on both sides thereof, and means for expressing the degree to be expressed by a weighting factor of the reference color. And an image processing apparatus that adjusts the brightness, saturation, and hue of a specific color using the adjustment parameters of both reference colors.

そして、本発明は、彩度Ｄがある閾値より小さいときに前記重み係数をゼロにして、ノイズを防ぐ画像処理装置である。   The present invention is an image processing apparatus that prevents noise by setting the weighting coefficient to zero when the saturation D is smaller than a certain threshold value.

更に、本発明は、前記明度調整手段は、色の濃さを反映させた明度の調整を行い、薄い色に対して明度調整を軽くする画像処理装置である。   Furthermore, the present invention is an image processing apparatus in which the lightness adjusting means adjusts the lightness reflecting the color intensity and lightens the lightness adjustment for a light color.

また、本発明は、前記彩度調整手段と前記明度調整手段は、それぞれ調整前の色相に基づいて彩度と明度の調整を行う画像処理装置である。   Further, the present invention is an image processing apparatus in which the saturation adjustment unit and the brightness adjustment unit each adjust saturation and brightness based on a hue before adjustment.

そして、本発明は、前記彩度調整手段と前記明度調整手段は、それぞれ調整後の色相に基づいて彩度と明度の調整を行う画像処理装置である。   The present invention is an image processing apparatus in which the saturation adjustment unit and the brightness adjustment unit each adjust the saturation and the brightness based on the adjusted hue.

更に、本発明は、前記彩度調整手段と前記明度調整手段は、それぞれ調整前又は調整後の色相に基づく２モードで彩度と明度の調整を行うことができる画像処理装置である。   Furthermore, the present invention is an image processing apparatus in which the saturation adjusting unit and the brightness adjusting unit can adjust saturation and brightness in two modes based on a hue before or after adjustment, respectively.

また、本発明は、前記画像処理を行い、明度、彩度及び色相の調整をそれぞれ独立して行う画像処理方法である。   The present invention is also an image processing method in which the image processing is performed and brightness, saturation, and hue are adjusted independently.

本発明によれば、入力されたＹＵＶ／ＣｒＣｂ画像において、明度・彩度・色相を同時に調整することができる。   According to the present invention, brightness, saturation, and hue can be simultaneously adjusted in an input YUV / CrCb image.

本発明を実施するための最良の形態を説明する。
本発明の画像処理装置及び画像処理方法の実施例について、図面を用いて説明する。 The best mode for carrying out the present invention will be described.
Embodiments of an image processing apparatus and an image processing method according to the present invention will be described with reference to the drawings.

本発明において、入力信号の値をＹｉｎ，Ｃｂｉｎ，Ｃｒｉｎとし、Ｃｂ−Ｃｒ座標系を以下の式６によって極座標に変換する。原点からの距離をＤ、Ｃｂ軸からの角度をθとする。

Figure 2007228240

となる。以上で求めた値のうち、θは色相、Ｄは彩度となり、Ｙｉｎが明度である。 In the present invention, the values of the input signal are Y in , Cb in , and Cr in , and the Cb-Cr coordinate system is converted into polar coordinates by the following equation (6). The distance from the origin is D, and the angle from the Cb axis is θ.
Figure 2007228240
It becomes. Of the values obtained above, θ is the hue, D is the saturation, and Y in is the lightness.

特定の色を独立で調整するために、基準となる色を設定する。その数はモニターの特性や目的に合わせて任意に設定することができるが、ここではＲ、Ｇ、Ｂ、Ｃ、Ｍ、Ｙｅの６色とし、それぞれの色相の値をθｒ，θｇ，θｂ，θｃ，θｍ，θｙｅとする。Ｃｂ−Ｃｒ空間は、この基準の色によって領域に分割される。分けられた領域を図１に示す。 In order to adjust a specific color independently, a reference color is set. The number can be arbitrarily set in accordance with the characteristics and purpose of the monitor. Here, six colors of R, G, B, C, M, and Ye are set, and the hue values are set to θ r , θ g , Let θ b , θ c , θ m , and θ ye . The Cb-Cr space is divided into regions by this reference color. The divided areas are shown in FIG.

ＩＴＵ−Ｒ ＢＴ ６０１の規格においては、色相の値は式７に示す。

Figure 2007228240
In the ITU-R BT 601 standard, the value of hue is shown in Equation 7.
Figure 2007228240

Ｒ、Ｇ、Ｂ、Ｙｅ、Ｃ、Ｍの６色（純色）を中心として重み係数分布を決定する。重み係数は中心が１で、その両側の基準色を０とする。重み係数分布は色々な形が考えられるが、図６には２種類の曲線を示す。θ０は中心となる純色で、θ１，θ２はその両側にある純色である。例えば、中心となる色がＲであれば、その両側にある色はＭとＹｅになる。この時、θ０＝θｒ，θ１＝θｍ，θ２＝θｙｅとなる。中心Ｒに対する重み係数の分布範囲の一例を、図２のＳ１で示す。 The weighting coefficient distribution is determined centering on six colors (pure colors) of R, G, B, Ye, C, and M. The center of the weighting coefficient is 1, and the reference colors on both sides are 0. There are various types of weighting coefficient distributions, and FIG. 6 shows two types of curves. θ 0 is a central pure color, and θ 1 and θ 2 are pure colors on both sides thereof. For example, if the central color is R, the colors on both sides are M and Ye. At this time, [theta] 0 = [theta] r , [theta] 1 = [theta] m , and [theta] 2 = [theta] ye . An example of the distribution range of the weighting coefficient with respect to the center R is indicated by S1 in FIG.

Ｒ、Ｇ、Ｂ、Ｙｅ、Ｃ、Ｍの６色は、それぞれに重み係数分布を定めても良いが、共通にすることが多い。   The six colors R, G, B, Ye, C, and M may each have a weight coefficient distribution, but are often shared.

入力画素の色相は、式６から求める。得た値θで入力された色がどの領域に属しているかを判定する。例えば図２にある点Ｐ（Ｃｂｉｎ，Ｃｒｉｎ）に対して、その色相はθｐである。θｐはθｙｅとθｒとの間にあるので、点Ｐの補正は色Ｙｅと色Ｒにしか関係ない。 The hue of the input pixel is obtained from Equation 6. It is determined to which region the color input with the obtained value θ belongs. For example, for a point P (Cb in , Cr in ) in FIG. 2, the hue is θ p . Since θ p is between θ ye and θ r , the correction of point P is only related to color Ye and color R.

点Ｐにする重み係数の特定について、図７を用いて説明する。Ｗｙｅは色Ｙｅの重み係数の分布で、Ｗｒは色Ｒの重み係数分布である。θｐで両分布曲線とそれぞれ交差する処は点Ｐにおける重み係数である。ここで、重み係数は２つあり、それぞれをＷ１、Ｗ２とする。このように、ある色に対して重み係数は２つ存在する。 The specification of the weighting coefficient for the point P will be described with reference to FIG. Wye is a distribution of weighting factors of color Ye, and Wr is a distribution of weighting factors of color R. The point where the two distribution curves intersect at θ p is the weighting coefficient at point P. Here, there are two weighting factors, which are W1 and W2, respectively. Thus, there are two weighting factors for a certain color.

実施例１について、図３を用いて説明する。入力信号はＹｉｎ、Ｃｂｉｎ、Ｃｒｉｎである。極座標計算部は、ＣｂｉｎとＣｒｉｎからθとＤを算出する。極座標変換はＣＯＲＤＩＣアルゴリズムを利用することが多い。重み係数計算部は、θを使って図７から重み係数を決定する。Ｄ＝０は無彩色を意味する。Ｄがある閾値より小さいときには、重み係数Ｗ１、Ｗ２をゼロにする。Ｋｈｘ，Ｋｓｘ，Ｋｂｘは、それぞれ色相、彩度、明度の調整係数で、外部から入力される。ここで、ｘ＝Ｒ、Ｇ、Ｂ、Ｃ、Ｍ、Ｙｅである。 Example 1 will be described with reference to FIG. Input signals are Y in , Cb in , and Cr in . Polar coordinates calculating unit calculates the θ and D from Cb in and Cr in. Polar coordinate transformation often uses the CORDIC algorithm. The weighting factor calculator determines the weighting factor from FIG. 7 using θ. D = 0 means an achromatic color. When D is smaller than a certain threshold, the weighting factors W1 and W2 are set to zero. Khx, Ksx, and Kbx are hue, saturation, and brightness adjustment coefficients, respectively, and are input from the outside. Here, x = R, G, B, C, M, Ye.

明度調整は、式８を用いて行う。明度の変化は視覚に敏感である。色空間の連続性を保持するため、明度が低い色の場合には調整を軽減する必要がある。このため、係数にＤを入れて彩度を反映する。

Figure 2007228240
The brightness adjustment is performed using Equation 8. Changes in brightness are sensitive to vision. In order to maintain the continuity of the color space, it is necessary to reduce the adjustment in the case of a color with low brightness. For this reason, the saturation is reflected by adding D to the coefficient.
Figure 2007228240

彩度調整は、式９を用いて行う。彩度調整結果Ｃｂ１とＣｒ１を色相調整にも使用する。

Figure 2007228240
Saturation adjustment is performed using Equation 9. The saturation adjustment results Cb1 and Cr1 are also used for hue adjustment.
Figure 2007228240

色相調整は、式１０を用いて行う。色相調整の入力信号は、彩度調整の結果信号を使う。

Figure 2007228240

Figure 2007228240
 Hue adjustment is performed using Equation 10. As a hue adjustment input signal, a saturation adjustment result signal is used.
Figure 2007228240
Figure 2007228240

実施例２について、図４を用いて説明する。実施例１では、彩度と明度の調整は調整前の色相に基づいて行っている。このため、色相調整後の特定な色信号に、彩度と明度調整はできない。例えば、赤信号に対して色相を２０°回転させる処理をした後、同じく赤信号に対して彩度を１．５倍する処理を行う際には、彩度の調整対象は色相調整前の赤信号となるため、色相調整後の赤信号に対して彩度を調整することができない。   Example 2 will be described with reference to FIG. In the first embodiment, the saturation and brightness are adjusted based on the hue before adjustment. For this reason, saturation and brightness cannot be adjusted for a specific color signal after hue adjustment. For example, after performing the process of rotating the hue by 20 ° with respect to the red signal, and similarly performing the process of multiplying the saturation by 1.5 with respect to the red signal, the saturation adjustment target is the red before the hue adjustment. Since it becomes a signal, the saturation cannot be adjusted with respect to the red signal after the hue adjustment.

実施例２では、色相調整用の角度を算出し、それを用いて明度と彩度の調整に適用することによって色相調整後の明度・彩度調整を実現することができる。   In the second embodiment, the hue adjustment angle after the hue adjustment can be realized by calculating the hue adjustment angle and applying the calculated angle to the adjustment of the brightness and the saturation.

極座標計算部は、図３と同じである。重み係数計算１は、θを使って図７から重み係数を決定する。Ｄ＝０は無彩色を意味する。Ｄがある閾値より小さいときには、重み係数Ｗ１、Ｗ２をゼロにする。Ｋｈｘ，Ｋｓｘ，Ｋｂｘは、それぞれ色相、彩度、明度の調整係数で、外部から入力される。ここで、ｘ＝Ｒ、Ｇ、Ｂ、Ｃ、Ｍ、Ｙｅである。   The polar coordinate calculation unit is the same as in FIG. In the weighting factor calculation 1, the weighting factor is determined from FIG. 7 using θ. D = 0 means an achromatic color. When D is smaller than a certain threshold, the weighting factors W1 and W2 are set to zero. Khx, Ksx, and Kbx are hue, saturation, and brightness adjustment coefficients, respectively, and are input from the outside. Here, x = R, G, B, C, M, Ye.

色相調整部１は、式１２で調整したΔθを算出する。

Figure 2007228240
The hue adjustment unit 1 calculates Δθ adjusted by Expression 12.
Figure 2007228240

重み係数計算２は、θではなく、θ’＝Δθ＋θを使って図７から重み係数を決定する。決定した重み係数をＷ１／Ｗ２でなく、Ｗ１’／Ｗ２’を記す。Ｄ＝０は色無しを意味する。Ｄがある閾値より小さいとき、重み係数Ｗ１／Ｗ２をゼロにする。ここで、重み係数はＬＵＴ（ルックアップテーブル）を利用することが多いので、重み係数計算１と重み係数計算２は、ＬＵＴを共用することが多い。   The weighting factor calculation 2 determines the weighting factor from FIG. 7 using θ ′ = Δθ + θ instead of θ. The determined weighting factor is not W1 / W2, but W1 '/ W2'. D = 0 means no color. When D is smaller than a certain threshold, the weight coefficient W1 / W2 is set to zero. Here, since the LUT (lookup table) is often used as the weighting factor, the weighting factor calculation 1 and the weighting factor calculation 2 often share the LUT.

Ｗ１’／Ｗ２’を使って、明度調整は式１３で行う。

Figure 2007228240
Using W1 ′ / W2 ′, brightness adjustment is performed using Equation 13.
Figure 2007228240

Ｗ１’／Ｗ２’を使って、彩度調整は式１４にて行う。

Figure 2007228240
Saturation adjustment is performed using Equation 14 using W1 ′ / W2 ′.
Figure 2007228240

Ｃｂ１とＣｒ１を使って、色相調整部２より式１５で行う。

Figure 2007228240
Using Cb 1 and Cr 1, the hue adjustment unit 2 performs the calculation using Equation 15.
Figure 2007228240

実施例３について、図５を用いて説明する。本実施例においては、同じ回路に実施例１と実施例２の機能を同時に搭載し、制御信号Ｋｍによって重み係数を切り替えることができる。例えば、モード１（ｋｍ＝０）のときに、実施例１の機能を実現し、モード２（ｋｍ＝１）のときに実施例２の機能を実現する。このような方法によって、より柔軟なシステム構成ができる。   Example 3 will be described with reference to FIG. In the present embodiment, the functions of the first embodiment and the second embodiment can be simultaneously mounted on the same circuit, and the weighting factor can be switched by the control signal Km. For example, the function of the first embodiment is realized when mode 1 (km = 0), and the function of the second embodiment is realized when mode 2 (km = 1). By such a method, a more flexible system configuration can be achieved.

ＹｅＣＭＲＧＢの６色を境界とした色の領域分割の説明図。Explanatory drawing of the area | region division | segmentation of the color which made 6 colors of YeCMRGB a boundary. 重み係数の範囲の説明図。Explanatory drawing of the range of a weighting coefficient. 色相調整前の情報を用いた彩度・明度調整手法の説明図。Explanatory drawing of the saturation / brightness adjustment method using the information before hue adjustment. 色相調整後の情報を用いた彩度・明度調整手法の説明図。Explanatory drawing of the saturation / brightness adjustment method using the information after hue adjustment. 切り替えモード付き色相・彩度・明度調整手法の説明図。Explanatory drawing of the hue / saturation / lightness adjustment method with a switching mode. ＲＧＢＹｅＭＣの６色における重み係数の説明図。Explanatory drawing of the weighting coefficient in six colors of RGBYeMC. 色相θｐにおける重み係数の説明図。Explanatory drawing of the weighting coefficient in hue (theta) p .

Claims (8)

入力された信号により表示される色を調整する表示装置を備えるとともに、入力信号の値のうちのＣｒ、Ｃｂを極座標変換する手段と、極座標空間の角度を用いて色を特定し、特定した色に明度の調整を行う明度調整手段と、特定した色に彩度の調整を行う彩度調整手段と、特定した色に色相の調整を行う色相調整手段とを有し、明度、彩度及び色相の調整をそれぞれ独立して行うことを特徴とする画像処理装置。   A display device for adjusting a color displayed by an input signal is provided, and a color is specified by using means for converting polar coordinates of Cr and Cb in the value of the input signal and an angle of the polar coordinate space, and the specified color Brightness adjustment means for adjusting brightness, saturation adjustment means for adjusting saturation for the specified color, and hue adjustment means for adjusting hue for the specified color, brightness, saturation and hue. The image processing apparatus is characterized in that each of the adjustments is performed independently. 複数基準色を用いて色領域を分割する手段と、特定な色をその両側の基準色の延長と見做し、見做す程度は基準色の重み係数で表する手段と有し、両基準色の調整パラメータを用いて特定色の明度、彩度及び色相の調整を行う請求項１記載の画像処理装置。   A means for dividing a color area using a plurality of reference colors, a means for treating a specific color as an extension of a reference color on both sides thereof, and a means for expressing the degree to be regarded as a weighting factor of the reference color. The image processing apparatus according to claim 1, wherein the brightness, saturation, and hue of a specific color are adjusted using a color adjustment parameter. 彩度Ｄがある閾値より小さいときに前記重み係数をゼロにして、ノイズを防ぐ請求項２記載の画像処理装置。   The image processing apparatus according to claim 2, wherein when the saturation D is smaller than a certain threshold, the weighting coefficient is set to zero to prevent noise. 前記明度調整手段は、色の濃さを反映させた明度の調整を行い、薄い色に対して明度調整を軽くする請求項１記載の画像処理装置。   The image processing apparatus according to claim 1, wherein the lightness adjusting unit adjusts the lightness reflecting the color intensity to lighten the lightness adjustment for a light color. 前記彩度調整手段と前記明度調整手段は、それぞれ調整前の色相に基づいて彩度と明度の調整を行う請求項１記載の画像処理装置。   The image processing apparatus according to claim 1, wherein the saturation adjustment unit and the brightness adjustment unit each adjust saturation and brightness based on a hue before adjustment. 前記彩度調整手段と前記明度調整手段は、それぞれ調整後の色相に基づいて彩度と明度の調整を行う請求項１記載の画像処理装置。   The image processing apparatus according to claim 1, wherein the saturation adjusting unit and the brightness adjusting unit adjust saturation and brightness based on the adjusted hue, respectively. 前記彩度調整手段と前記明度調整手段は、それぞれ調整前又は調整後の色相に基づく２モードで彩度と明度の調整を行うことができる請求項１記載の画像処理装置。   The image processing apparatus according to claim 1, wherein the saturation adjustment unit and the brightness adjustment unit can adjust saturation and brightness in two modes based on a hue before or after adjustment, respectively. 請求項１〜７のいずれか１項に記載の画像処理を行い、明度、彩度及び色相の調整をそれぞれ独立して行う画像処理方法。   An image processing method for performing image processing according to any one of claims 1 to 7 and independently adjusting brightness, saturation, and hue.
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